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Java > Open Source Codes > org > mr > core > cmc > GarbageCollectionJMX


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
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7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
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11  * Software distributed under the License is distributed on an "AS IS" basis,
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13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is lital kasif.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
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22  * Contributor(s): all the names of the contributors are added in the source
23  * code where applicable.
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25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
27  * provisions of LGPL are applicable instead of those above. If you wish to
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33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
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36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
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42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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46 /*
47  * reated on Sep 20, 2004
48  * Manta LTD
49  */
50 package org.mr.core.cmc;
51
52 import org.apache.commons.logging.Log;
53 import org.apache.commons.logging.LogFactory;
54
55 import javax.management.*;
56
57 /**
58  * "Does Garbage Collection and returnds it's result."
59  *
60  * @author lital kasif
61  */
62 public class GarbageCollectionJMX extends StandardMBean implements GarbageCollectionJMXMBean {
63     long free, memoryInVM, usedBefore, usedAfter;
64     public Log log;
65     
66         public GarbageCollectionJMX()throws NotCompliantMBeanException {
67             super(GarbageCollectionJMXMBean.class);
68             log=LogFactory.getLog("GarbageCollectionJMX");
69         }
70
71   /**
72    * Does Garbage Collection
73    * @return returnds the garbage collection resault as a string.
74    */
75         public String JavaDoc collect() {
76             // check if argument is ok
77 free = Runtime.getRuntime().freeMemory()/1000;
78             memoryInVM = Runtime.getRuntime().totalMemory()/1000;
79             usedBefore = memoryInVM - free;
80             
81             Runtime.getRuntime().gc();
82             
83             free = Runtime.getRuntime().freeMemory()/1000;
84             memoryInVM = Runtime.getRuntime().totalMemory()/1000;
85             usedAfter = memoryInVM - free;
86             
87             String JavaDoc result = "The VM used "+usedBefore+"KB memory befor GC , the VM used "
88             +usedAfter+" memory after GC , "+(usedBefore -usedAfter )+ " memory collected ";
89             return result;
90         }
91
92      protected String JavaDoc getDescription(MBeanInfo i_mBeanInfo) {
93         return "Does Garbage Collection and returnds the results of it.";
94     }
95
96     protected String JavaDoc getDescription(MBeanOperationInfo i_mBeanOperationInfo) {
97         return "Does Garbage Collection";
98     }
99 }
100
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